90666620 has 48 divisors (see below), whose sum is σ = 208631808. Its totient is φ = 32823360.

The previous prime is 90666607. The next prime is 90666629. The reversal of 90666620 is 2666609.

90666620 = 3363² + 3364² + ... + 3370².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90666629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57077 + ... + 58643.

It is an arithmetic number, because the mean of its divisors is an integer number (4346496).

Almost surely, 2^90666620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90666620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104315904).

90666620 is an abundant number, since it is smaller than the sum of its proper divisors (117965188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90666620 is a wasteful number, since it uses less digits than its factorization.

90666620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850 (or 1848 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 90666620 is about 9521.9021209000. The cubic root of 90666620 is about 449.2441963108.

Subtracting from 90666620 its reverse (2666609), we obtain a triangular number (88000011 = T₁₃₂₆₆).

The spelling of 90666620 in words is "ninety million, six hundred sixty-six thousand, six hundred twenty".